possible deadlock in evdev_pass_values

From: syzbot
Date: Sat Jan 09 2021 - 06:58:56 EST

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Hello,

syzbot found the following issue on:

HEAD commit: 6207214a Merge tag 'afs-fixes-04012021' of git://git.kerne..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16558750d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=8aa30b9da402d224
dashboard link: https://syzkaller.appspot.com/bug?extid=44ec99f248f7052472f1
compiler: gcc (GCC) 10.1.0-syz 20200507

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+44ec99f248f7052472f1@xxxxxxxxxxxxxxxxxxxxxxxxx

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
5.11.0-rc2-syzkaller #0 Not tainted
-----------------------------------------------------
syz-executor.4/17012 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffff888013a7f210 (&new->fa_lock){.+.+}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:1004 [inline]
ffff888013a7f210 (&new->fa_lock){.+.+}-{2:2}, at: kill_fasync fs/fcntl.c:1025 [inline]
ffff888013a7f210 (&new->fa_lock){.+.+}-{2:2}, at: kill_fasync+0x14b/0x460 fs/fcntl.c:1018

and this task is already holding:
ffff88806c53b028 (&client->buffer_lock){..-.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline]
ffff88806c53b028 (&client->buffer_lock){..-.}-{2:2}, at: evdev_pass_values.part.0+0xf6/0x970 drivers/input/evdev.c:261
which would create a new lock dependency:
(&client->buffer_lock){..-.}-{2:2} -> (&new->fa_lock){.+.+}-{2:2}

but this new dependency connects a SOFTIRQ-irq-safe lock:
(&client->buffer_lock){..-.}-{2:2}

... which became SOFTIRQ-irq-safe at:
lock_acquire kernel/locking/lockdep.c:5437 [inline]
lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:354 [inline]
evdev_pass_values.part.0+0xf6/0x970 drivers/input/evdev.c:261
evdev_pass_values drivers/input/evdev.c:253 [inline]
evdev_events+0x28b/0x3f0 drivers/input/evdev.c:306
input_to_handler+0x2a0/0x4c0 drivers/input/input.c:115
input_pass_values.part.0+0x284/0x700 drivers/input/input.c:145
input_pass_values drivers/input/input.c:134 [inline]
input_handle_event+0x373/0x1440 drivers/input/input.c:404
input_event drivers/input/input.c:446 [inline]
input_event+0x8e/0xb0 drivers/input/input.c:438
input_sync include/linux/input.h:450 [inline]
usbtouch_process_pkt+0x25c/0x460 drivers/input/touchscreen/usbtouchscreen.c:1404
usbtouch_irq+0x192/0x380 drivers/input/touchscreen/usbtouchscreen.c:1517
__usb_hcd_giveback_urb+0x2b0/0x5c0 drivers/usb/core/hcd.c:1657
usb_hcd_giveback_urb+0x367/0x410 drivers/usb/core/hcd.c:1728
dummy_timer+0x11f4/0x3280 drivers/usb/gadget/udc/dummy_hcd.c:1971
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1417
expire_timers kernel/time/timer.c:1462 [inline]
__run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1731
__run_timers kernel/time/timer.c:1712 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744
__do_softirq+0x2a5/0x9f7 kernel/softirq.c:343
asm_call_irq_on_stack+0xf/0x20
__run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
invoke_softirq kernel/softirq.c:226 [inline]
__irq_exit_rcu kernel/softirq.c:420 [inline]
irq_exit_rcu+0x134/0x200 kernel/softirq.c:432
sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
__orc_find+0x0/0xf0 include/asm-generic/rwonce.h:68
orc_find arch/x86/kernel/unwind_orc.c:173 [inline]
unwind_next_frame+0x342/0x1f90 arch/x86/kernel/unwind_orc.c:443
arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:356
____kasan_slab_free+0xe1/0x110 mm/kasan/common.c:362
kasan_slab_free include/linux/kasan.h:188 [inline]
slab_free_hook mm/slub.c:1547 [inline]
slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1580
slab_free mm/slub.c:3142 [inline]
kfree+0xdb/0x360 mm/slub.c:4124
tomoyo_realpath_from_path+0x191/0x620 security/tomoyo/realpath.c:291
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x21b/0x400 security/tomoyo/file.c:822
security_inode_getattr+0xcf/0x140 security/security.c:1280
vfs_getattr fs/stat.c:121 [inline]
vfs_statx+0x164/0x390 fs/stat.c:189
vfs_fstatat fs/stat.c:207 [inline]
vfs_lstat include/linux/fs.h:3122 [inline]
__do_sys_newlstat+0x91/0x110 fs/stat.c:362
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9

to a SOFTIRQ-irq-unsafe lock:
(&new->fa_lock){.+.+}-{2:2}

... which became SOFTIRQ-irq-unsafe at:
...
lock_acquire kernel/locking/lockdep.c:5437 [inline]
lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
kill_fasync_rcu fs/fcntl.c:1004 [inline]
kill_fasync fs/fcntl.c:1025 [inline]
kill_fasync+0x14b/0x460 fs/fcntl.c:1018
fsnotify_add_event+0x398/0x4e0 fs/notify/notification.c:127
inotify_handle_inode_event+0x340/0x5f0 fs/notify/inotify/inotify_fsnotify.c:118
fsnotify_handle_inode_event.isra.0+0x1b8/0x270 fs/notify/fsnotify.c:263
fsnotify_handle_event fs/notify/fsnotify.c:310 [inline]
send_to_group fs/notify/fsnotify.c:364 [inline]
fsnotify+0xbf0/0x1070 fs/notify/fsnotify.c:541
fsnotify_parent include/linux/fsnotify.h:71 [inline]
fsnotify_file include/linux/fsnotify.h:90 [inline]
fsnotify_open include/linux/fsnotify.h:268 [inline]
do_sys_openat2+0x3a3/0x420 fs/open.c:1177
do_sys_open fs/open.c:1188 [inline]
__do_sys_open fs/open.c:1196 [inline]
__se_sys_open fs/open.c:1192 [inline]
__x64_sys_open+0x119/0x1c0 fs/open.c:1192
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9

other info that might help us debug this:

Possible interrupt unsafe locking scenario:

CPU0 CPU1
---- ----
lock(&new->fa_lock);
local_irq_disable();
lock(&client->buffer_lock);
lock(&new->fa_lock);
<Interrupt>
lock(&client->buffer_lock);

*** DEADLOCK ***

7 locks held by syz-executor.4/17012:
#0: ffff888144ee5110 (&evdev->mutex){+.+.}-{3:3}, at: evdev_write+0x1d3/0x760 drivers/input/evdev.c:513
#1: ffff888017aea230 (&dev->event_lock){-.-.}-{2:2}, at: input_inject_event+0xa6/0x310 drivers/input/input.c:471
#2: ffffffff8b363860 (rcu_read_lock){....}-{1:2}, at: is_event_supported drivers/input/input.c:53 [inline]
#2: ffffffff8b363860 (rcu_read_lock){....}-{1:2}, at: is_event_supported drivers/input/input.c:50 [inline]
#2: ffffffff8b363860 (rcu_read_lock){....}-{1:2}, at: input_inject_event+0x92/0x310 drivers/input/input.c:470
#3: ffffffff8b363860 (rcu_read_lock){....}-{1:2}, at: input_pass_values.part.0+0x0/0x700 drivers/input/input.c:837
#4: ffffffff8b363860 (rcu_read_lock){....}-{1:2}, at: evdev_events+0x59/0x3f0 drivers/input/evdev.c:296
#5: ffff88806c53b028 (&client->buffer_lock){..-.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline]
#5: ffff88806c53b028 (&client->buffer_lock){..-.}-{2:2}, at: evdev_pass_values.part.0+0xf6/0x970 drivers/input/evdev.c:261
#6: ffffffff8b363860 (rcu_read_lock){....}-{1:2}, at: kill_fasync+0x3d/0x460 fs/fcntl.c:1023

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
-> (&client->buffer_lock){..-.}-{2:2} {
IN-SOFTIRQ-W at:
lock_acquire kernel/locking/lockdep.c:5437 [inline]
lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:354 [inline]
evdev_pass_values.part.0+0xf6/0x970 drivers/input/evdev.c:261
evdev_pass_values drivers/input/evdev.c:253 [inline]
evdev_events+0x28b/0x3f0 drivers/input/evdev.c:306
input_to_handler+0x2a0/0x4c0 drivers/input/input.c:115
input_pass_values.part.0+0x284/0x700 drivers/input/input.c:145
input_pass_values drivers/input/input.c:134 [inline]
input_handle_event+0x373/0x1440 drivers/input/input.c:404
input_event drivers/input/input.c:446 [inline]
input_event+0x8e/0xb0 drivers/input/input.c:438
input_sync include/linux/input.h:450 [inline]
usbtouch_process_pkt+0x25c/0x460 drivers/input/touchscreen/usbtouchscreen.c:1404
usbtouch_irq+0x192/0x380 drivers/input/touchscreen/usbtouchscreen.c:1517
__usb_hcd_giveback_urb+0x2b0/0x5c0 drivers/usb/core/hcd.c:1657
usb_hcd_giveback_urb+0x367/0x410 drivers/usb/core/hcd.c:1728
dummy_timer+0x11f4/0x3280 drivers/usb/gadget/udc/dummy_hcd.c:1971
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1417
expire_timers kernel/time/timer.c:1462 [inline]
__run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1731
__run_timers kernel/time/timer.c:1712 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744
__do_softirq+0x2a5/0x9f7 kernel/softirq.c:343
asm_call_irq_on_stack+0xf/0x20
__run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
invoke_softirq kernel/softirq.c:226 [inline]
__irq_exit_rcu kernel/softirq.c:420 [inline]
irq_exit_rcu+0x134/0x200 kernel/softirq.c:432
sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
__orc_find+0x0/0xf0 include/asm-generic/rwonce.h:68
orc_find arch/x86/kernel/unwind_orc.c:173 [inline]
unwind_next_frame+0x342/0x1f90 arch/x86/kernel/unwind_orc.c:443
arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:356
____kasan_slab_free+0xe1/0x110 mm/kasan/common.c:362
kasan_slab_free include/linux/kasan.h:188 [inline]
slab_free_hook mm/slub.c:1547 [inline]
slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1580
slab_free mm/slub.c:3142 [inline]
kfree+0xdb/0x360 mm/slub.c:4124
tomoyo_realpath_from_path+0x191/0x620 security/tomoyo/realpath.c:291
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x21b/0x400 security/tomoyo/file.c:822
security_inode_getattr+0xcf/0x140 security/security.c:1280
vfs_getattr fs/stat.c:121 [inline]
vfs_statx+0x164/0x390 fs/stat.c:189
vfs_fstatat fs/stat.c:207 [inline]
vfs_lstat include/linux/fs.h:3122 [inline]
__do_sys_newlstat+0x91/0x110 fs/stat.c:362
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5437 [inline]
lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:354 [inline]
evdev_pass_values.part.0+0xf6/0x970 drivers/input/evdev.c:261
evdev_pass_values drivers/input/evdev.c:253 [inline]
evdev_events+0x28b/0x3f0 drivers/input/evdev.c:306
input_to_handler+0x2a0/0x4c0 drivers/input/input.c:115
input_pass_values.part.0+0x284/0x700 drivers/input/input.c:145
input_pass_values drivers/input/input.c:134 [inline]
input_handle_event+0x373/0x1440 drivers/input/input.c:404
input_inject_event+0x2f5/0x310 drivers/input/input.c:476
evdev_write+0x430/0x760 drivers/input/evdev.c:530
vfs_write+0x28e/0xa30 fs/read_write.c:603
ksys_write+0x1ee/0x250 fs/read_write.c:658
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
}
... key at: [<ffffffff8fa51420>] __key.4+0x0/0x40
... acquired at:
lock_acquire kernel/locking/lockdep.c:5437 [inline]
lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
kill_fasync_rcu fs/fcntl.c:1004 [inline]
kill_fasync fs/fcntl.c:1025 [inline]
kill_fasync+0x14b/0x460 fs/fcntl.c:1018
__pass_event drivers/input/evdev.c:240 [inline]
evdev_pass_values.part.0+0x64e/0x970 drivers/input/evdev.c:278
evdev_pass_values drivers/input/evdev.c:253 [inline]
evdev_events+0x28b/0x3f0 drivers/input/evdev.c:306
input_to_handler+0x2a0/0x4c0 drivers/input/input.c:115
input_pass_values.part.0+0x284/0x700 drivers/input/input.c:145
input_pass_values drivers/input/input.c:134 [inline]
input_handle_event+0x373/0x1440 drivers/input/input.c:404
input_inject_event+0x2f5/0x310 drivers/input/input.c:476
evdev_write+0x430/0x760 drivers/input/evdev.c:530
vfs_write+0x28e/0xa30 fs/read_write.c:603
ksys_write+0x1ee/0x250 fs/read_write.c:658
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9

the dependencies between the lock to be acquired
and SOFTIRQ-irq-unsafe lock:
-> (&new->fa_lock){.+.+}-{2:2} {
HARDIRQ-ON-R at:
lock_acquire kernel/locking/lockdep.c:5437 [inline]
lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
kill_fasync_rcu fs/fcntl.c:1004 [inline]
kill_fasync fs/fcntl.c:1025 [inline]
kill_fasync+0x14b/0x460 fs/fcntl.c:1018
fsnotify_add_event+0x398/0x4e0 fs/notify/notification.c:127
inotify_handle_inode_event+0x340/0x5f0 fs/notify/inotify/inotify_fsnotify.c:118
fsnotify_handle_inode_event.isra.0+0x1b8/0x270 fs/notify/fsnotify.c:263
fsnotify_handle_event fs/notify/fsnotify.c:310 [inline]
send_to_group fs/notify/fsnotify.c:364 [inline]
fsnotify+0xbf0/0x1070 fs/notify/fsnotify.c:541
fsnotify_parent include/linux/fsnotify.h:71 [inline]
fsnotify_file include/linux/fsnotify.h:90 [inline]
fsnotify_open include/linux/fsnotify.h:268 [inline]
do_sys_openat2+0x3a3/0x420 fs/open.c:1177
do_sys_open fs/open.c:1188 [inline]
__do_sys_open fs/open.c:1196 [inline]
__se_sys_open fs/open.c:1192 [inline]
__x64_sys_open+0x119/0x1c0 fs/open.c:1192
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
SOFTIRQ-ON-R at:
lock_acquire kernel/locking/lockdep.c:5437 [inline]
lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
kill_fasync_rcu fs/fcntl.c:1004 [inline]
kill_fasync fs/fcntl.c:1025 [inline]
kill_fasync+0x14b/0x460 fs/fcntl.c:1018
fsnotify_add_event+0x398/0x4e0 fs/notify/notification.c:127
inotify_handle_inode_event+0x340/0x5f0 fs/notify/inotify/inotify_fsnotify.c:118
fsnotify_handle_inode_event.isra.0+0x1b8/0x270 fs/notify/fsnotify.c:263
fsnotify_handle_event fs/notify/fsnotify.c:310 [inline]
send_to_group fs/notify/fsnotify.c:364 [inline]
fsnotify+0xbf0/0x1070 fs/notify/fsnotify.c:541
fsnotify_parent include/linux/fsnotify.h:71 [inline]
fsnotify_file include/linux/fsnotify.h:90 [inline]
fsnotify_open include/linux/fsnotify.h:268 [inline]
do_sys_openat2+0x3a3/0x420 fs/open.c:1177
do_sys_open fs/open.c:1188 [inline]
__do_sys_open fs/open.c:1196 [inline]
__se_sys_open fs/open.c:1192 [inline]
__x64_sys_open+0x119/0x1c0 fs/open.c:1192
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5437 [inline]
lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402
__raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline]
_raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:311
fasync_remove_entry+0xb6/0x1f0 fs/fcntl.c:882
fasync_helper+0x9e/0xb0 fs/fcntl.c:985
fsnotify_fasync+0x4d/0x80 fs/notify/group.c:148
__fput+0x70d/0x920 fs/file_table.c:277
task_work_run+0xdd/0x190 kernel/task_work.c:140
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:201
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302
entry_SYSCALL_64_after_hwframe+0x44/0xa9
INITIAL READ USE at:
lock_acquire kernel/locking/lockdep.c:5437 [inline]
lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
kill_fasync_rcu fs/fcntl.c:1004 [inline]
kill_fasync fs/fcntl.c:1025 [inline]
kill_fasync+0x14b/0x460 fs/fcntl.c:1018
fsnotify_add_event+0x398/0x4e0 fs/notify/notification.c:127
inotify_handle_inode_event+0x340/0x5f0 fs/notify/inotify/inotify_fsnotify.c:118
fsnotify_handle_inode_event.isra.0+0x1b8/0x270 fs/notify/fsnotify.c:263
fsnotify_handle_event fs/notify/fsnotify.c:310 [inline]
send_to_group fs/notify/fsnotify.c:364 [inline]
fsnotify+0xbf0/0x1070 fs/notify/fsnotify.c:541
fsnotify_parent include/linux/fsnotify.h:71 [inline]
fsnotify_file include/linux/fsnotify.h:90 [inline]
fsnotify_open include/linux/fsnotify.h:268 [inline]
do_sys_openat2+0x3a3/0x420 fs/open.c:1177
do_sys_open fs/open.c:1188 [inline]
__do_sys_open fs/open.c:1196 [inline]
__se_sys_open fs/open.c:1192 [inline]
__x64_sys_open+0x119/0x1c0 fs/open.c:1192
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
}
... key at: [<ffffffff8ef8d980>] __key.0+0x0/0x40
... acquired at:
lock_acquire kernel/locking/lockdep.c:5437 [inline]
lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
kill_fasync_rcu fs/fcntl.c:1004 [inline]
kill_fasync fs/fcntl.c:1025 [inline]
kill_fasync+0x14b/0x460 fs/fcntl.c:1018
__pass_event drivers/input/evdev.c:240 [inline]
evdev_pass_values.part.0+0x64e/0x970 drivers/input/evdev.c:278
evdev_pass_values drivers/input/evdev.c:253 [inline]
evdev_events+0x28b/0x3f0 drivers/input/evdev.c:306
input_to_handler+0x2a0/0x4c0 drivers/input/input.c:115
input_pass_values.part.0+0x284/0x700 drivers/input/input.c:145
input_pass_values drivers/input/input.c:134 [inline]
input_handle_event+0x373/0x1440 drivers/input/input.c:404
input_inject_event+0x2f5/0x310 drivers/input/input.c:476
evdev_write+0x430/0x760 drivers/input/evdev.c:530
vfs_write+0x28e/0xa30 fs/read_write.c:603
ksys_write+0x1ee/0x250 fs/read_write.c:658
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9

stack backtrace:
CPU: 0 PID: 17012 Comm: syz-executor.4 Not tainted 5.11.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x107/0x163 lib/dump_stack.c:120
print_bad_irq_dependency kernel/locking/lockdep.c:2452 [inline]
check_irq_usage.cold+0x4f5/0x6c8 kernel/locking/lockdep.c:2681
check_prev_add kernel/locking/lockdep.c:2872 [inline]
check_prevs_add kernel/locking/lockdep.c:2993 [inline]
validate_chain kernel/locking/lockdep.c:3608 [inline]
__lock_acquire+0x2af6/0x5500 kernel/locking/lockdep.c:4832
lock_acquire kernel/locking/lockdep.c:5437 [inline]
lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
kill_fasync_rcu fs/fcntl.c:1004 [inline]
kill_fasync fs/fcntl.c:1025 [inline]
kill_fasync+0x14b/0x460 fs/fcntl.c:1018
__pass_event drivers/input/evdev.c:240 [inline]
evdev_pass_values.part.0+0x64e/0x970 drivers/input/evdev.c:278
evdev_pass_values drivers/input/evdev.c:253 [inline]
evdev_events+0x28b/0x3f0 drivers/input/evdev.c:306
input_to_handler+0x2a0/0x4c0 drivers/input/input.c:115
input_pass_values.part.0+0x284/0x700 drivers/input/input.c:145
input_pass_values drivers/input/input.c:134 [inline]
input_handle_event+0x373/0x1440 drivers/input/input.c:404
input_inject_event+0x2f5/0x310 drivers/input/input.c:476
evdev_write+0x430/0x760 drivers/input/evdev.c:530
vfs_write+0x28e/0xa30 fs/read_write.c:603
ksys_write+0x1ee/0x250 fs/read_write.c:658
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f99a251cc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219
RDX: 0000000000000bb8 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c
R13: 00000000016afb5f R14: 00007f99a251d9c0 R15: 000000000119bf8c

---
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